Re: [NSIS] Gen-Art Review: draft-ietf-nsis-qspec-22.txt

Gerald Ash <gash5107@yahoo.com> Sun, 22 November 2009 20:15 UTC

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Date: Sun, 22 Nov 2009 12:15:46 -0800 (PST)
From: Gerald Ash <gash5107@yahoo.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>
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Cc: IETF discussion list <ietf@ietf.org>, draft-ietf-nsis-qspec@tools.ietf.org, General Area Review Team <gen-art@ietf.org>, Mary Barnes <mary.barnes@nortel.com>, nsis@ietf.org
Subject: Re: [NSIS] Gen-Art Review: draft-ietf-nsis-qspec-22.txt
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Joel,
 
Thanks for the quick review.  I agree with all your comments and suggestions.
 
Regarding your suggestion on RFC type (change it from Informational to PS), I believe it could not become PS since the other NSIS documents (GIST & QoS-NSLP) are Experimental.
 
Thanks again,
Jerry

--- On Sat, 11/21/09, Joel M. Halpern <jmh@joelhalpern.com> wrote:


From: Joel M. Halpern <jmh@joelhalpern.com>
Subject: Gen-Art Review: draft-ietf-nsis-qspec-22.txt
To: "General Area Review Team" <gen-art@ietf.org>rg>, "Mary Barnes" <mary.barnes@nortel.com>
Cc: "Magnus Westerlun" <magnus.westerlund@ericsson.com>om>, "IETF discussion list" <ietf@ietf.org>rg>, nsis@ietf.org, draft-ietf-nsis-qspec@tools.ietf.org
Date: Saturday, November 21, 2009, 6:32 PM


I have been selected as the General Area Review Team (Gen-ART)
reviewer for this draft (for background on Gen-ART, please see
http://www.alvestrand.no/ietf/gen/art/gen-art-FAQ.html ).

Please resolve these comments along with any other Last Call comments
you may receive.

Document: draft-ietf-nsis-qspec-22
    QoS NSLP QSPEC Template
Reviewer: Joel Halpern
Review Date: 21-Nov-2009
IETF LC End Date: 25-Nov-2009
IESG Telechat date: N/A

Summary: This document is almost ready for publication as an RFC.
I am concerned about the RFC type.  If a revision of the document is needed, there are a few minor items to consider for inclusion.

Major:
I am unclear about whether the intended status (Informational) for this document is correct.
At first, it seemed correct.   The document is defined as providing a template for a resource specification block (a QSPEC), and other model specific documents are expected to define exactly what QoS paramters they will use.
It even seemed fine that this document mandates that the QSPEC include the indication of the QoS Model.  That is necessary information.

Where I start to have concerns is in section 3.1 of this document. There, the document starts specifying requirements on any and of QoS Model documents.  It says things like "A QOSM specification MUST include the following:".  If this document is defining normative requirements for standards track documents (and the text explicitly states that QOSM definitions sometimes need to be standards track), then I don't see how it can be an informational document.
If the QOSM requirements, and the QSPEC support requirements ("The QSPEC objects ... MUST be supported by QNEs.") are actually copied from some other document, then the problem is a lesser issue of unclear referent.  But if this document is the source for these normative requirements, it does seem that Informational is wrong.

Given that this document actually defines bits to be used on the wire, it may be appropriate to publish it as a PS.
Alternatively, BCP may be acceptable, although a bit unusual.

The fact that this document defines the format of information fields and includes the IANA registration for those fields to be used in QOSM documents also suggests that informational is inappropriate as it would create a conceptual dependence of all standards track QOSM documents on an Informational RFC.  Also, this document includes guidelines to follow in future IANA allocations.


Minor:
In describing the constraints parameters, the text in section 3.3.2 carefully describes the semantics, and the composition rule.  However, it seems to leave out the unit of measure. (The constraints are given in the detailed message information formats section, but it would seem sensible to include them in 3.3.2.)

Editorial:
Should there be an editorial note when "minimum QoS" is first described indicating that the term "minimum" is used generically, as for many parameters, like loss rate or latency, what needs to be specified is the maximum acceptable value?